Type-writing machine



No. 623,940. Patentd Apr.- 25, I899.

B. F. BLAKEMAN.

TYPE WRITING MACHINE.

(Application filed Aug. 19, 1898.)

(No Model.)

WITNESSES INYENTOR:

UNITED STATES PATENT OFFICE.

BENJAMIN F. BLAKEMAN, OF LOUISVILLE, KENTUCKY.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 623,940, dated April 25, 1899.

Application filed August 19, 1898. $erial N0- 689,054:. (No model.)

To all whom, it may concern.-

Be it known that I, BENJAMIN F. BLAKE- MAN, a citizen of the United States, residing at Louisville, in the county of Jefferson and State of Kentucky, have invented a new and useful Improvement in Type-Writing Machines, of which the following is a specification.

My invention relates to improvements in type-writing machines thatuse a platen and carriage.

The objects of my improvement are to pro: vide a means of regulating the number of lines on a type-written sheet or on a typewritten page by securing the automatic lockin g of the carriage of the type-writing machine or of the keys of the machine before the eX- treme bottom of the page has been reached, and thereby leaving a margin at the bottom of the page, which margin may be made of any desired width, the width of the margin being regulated by means of a graduated scale. I attain these objects by the mechanism illustrated in the accompanying drawings, in Which Figure 1 shows my invention and a portion of the platen and carriage of a typewriting machine, and though the principle of my invention may be applied in a number of ways to lock the carriage or the keys of the type-writing machine I prefer that mode of applying the principle of my invention hereinafter described. Fig. 2 represents the in- Vention disconnected from the type-writing machine.

The threaded sleeve or screw a is attached to the platen or on the platen-shaft, or it may be made in-the same piece with said shaft, a convenient arrangement being to attach said sleeve to the shaft 0 by the screw 1), whose head is sunk below the threads. The axis of the screw or sleeve must be a continuation of the axis of the platen or parallel thereto. I prefer to make it such continuation. The nut d on the threaded sleeve is kept in one and the same horizontal plane by an arm 6, fastened to the nut with the screw Z. One end at of this arm e rests upon a plain horizontal surface. The threads on said sleeve are lefthand threads, and when the platen h is revolvedin such manner as is necessary in spacing with the type-writing machine the nut d moves to the left and with it moves the arm e, attached to it.

f is a plain surface or bar which is a portion of the carriage of the type-writing machine, and when this moves the threaded sleeve moves with it. The plain surface upon which the end at of the arm e rests, as above stated, is the top surface of a portion of the carriage of the type-writing machine. When in process of spacing the platen revolves, the threaded sleeve or screw a revolves with it. The nut 01 is prevented from revolving by its attachment to arm c. It 'is therefore by its interior threading forced outward laterally, bearing with it said arm 6 in the direction of the slot 9 in the bar f, into'which slot the end a drops when the platen has made a certain amount of revolution.

- 0 is the tram or rail upon which moves the carriage f, and when the slot 9 in the carriage f has passed the point 70, which point is the terminus of the tram or rail 0, the extreme end n of the arm 6 having nothing to support it and the nut 01 being free to revolve, it is plain that the extreme end of the arm 6 will drop below the point 70, the terminus of the tram or rail 0, and the carriage will thereby be prevented from returning to its former position, and this constitutes a locking of the carriage of the type-writing machine.

I prefer to use the machine as above described; but the contrivance would on some styles of type-writing machines work without the slot, the end of the arm e being so ad j usted as to drop past the point 70 after certain revolutions of the platen and threaded sleeve or screw. It would work imperfectly with the slot and without the arrangement of the point is at the end of the tram; but there would be a dangerous strain on the arm, thus caught at only one point. It would be feasible to allow the arm to rest directly on the threaded sleeve or screw, one end being attached to the carriage in such manner as to permit lateral motion of the arm.

In Fig. 1, irepresents a graduated scale on the end of the platen h to be used in setting the arm e so that it will drop into the slot'g when a given number of lines has been written. In Fig. 1,j is an indicator to be used in conjunction with the scale 2'.

The method of using the scale is as follows: Revolve the platen h as in spacing until the arm 6 drops into the slot g. Then having lifted the arm 6 out of the slot g revolve the platen backward enough to correspond to the spacing necessary in writing the desired number of lines. Then note the figure on the scale to which the indicator points. This will be the figure to which the indicator must point at the beginning of each page. When the page has been finished, the arm 6 is brought back very near the starting-point by drawing the paper out of the machine in an opposite direction from that in which it was inserted, the indicator being made to point precisely to the proper figure on the scale 1' by a slight adjustment of the platen.

Vhat I claim as my invention, and desire to secure by Letters Patent, is

1. In a type-Writing machine having a platen and carriage, the combination of a screw a, firmly attached to the platen h, the nut (Z, having attached to it the arm 6, a plain barf provided with a stop, all substantially as set forth. a

2. In type writing machines, having a platen and carriage, the combination of the screw a attached to the platen h, a nut 01 having attached to it an arm e, a plain bar f provided with a stop having the slot 1 all substantially as described.

B. F. BLAKEMAN.

Vitnesses:

JAMES C. Pos'roN, JOHN C. GRAVES. 

